OpenAI now has five subscription tiers for ChatGPT. Free, Go, Plus, Pro at $100, and Pro at $200. If that sounds confusing, it is. And it tells you everything about where the AI business model is heading.

The new $100/month ChatGPT Pro tier dropped this week with one clear target: Anthropic. Specifically, Claude Code, the AI coding assistant that has been eating OpenAI alive since it launched in May 2025. Claude Code is now running at a $2.5 billion annual revenue rate, more than doubling since January. OpenAI needed an answer. This is it.

What You Get for $100

The new Pro tier gives you five times more Codex usage than the $20/month Plus plan. You also get priority request processing and access to GPT-5.3-Codex-Spark, a research preview model optimized for day-to-day coding tasks. Sam Altman announced this week that Codex hit three million weekly active users, and the company is resetting usage limits at every million-user milestone until they reach ten million.

The math is revealing. At $20/month, heavy Codex users were burning through their limits in hours. The $200/month tier existed but felt extreme for most developers. The $100 tier fills a gap that should not have existed in the first place.

The Real Story: Anthropic Set the Price

Look at Anthropic is pricing. Claude Pro at $100/month (Max 5x). Claude Max at $200/month (Max 20x). OpenAI just matched it dollar for dollar. This is not innovation. This is price matching. And it reveals something important: Anthropic is setting the terms in AI coding, and OpenAI is playing catch-up.

When OpenAI launched Codex initially in April 2025, it had the market to itself. That window closed fast. Claude Code exploded because developers found it better for complex, multi-file engineering tasks. The standalone Codex desktop app for Mac launched in February 2026 helped claw back some share, but the momentum was already with Anthropic.

Vibe Coding Changed the Economics

Here is the bigger picture. Vibe coding turned AI from a novelty into a workflow. Developers are not asking ChatGPT trivia questions anymore. They are running hour-long coding sessions that consume enormous amounts of compute. That is why flat-rate pricing keeps breaking. Anthropic already killed its flat rate for third-party agents. Now both companies are building tier ladders to capture the value of heavy users without hemorrhaging money on unlimited plans.

The AI coding market is becoming a subscription arms race. Five tiers at OpenAI. Four at Anthropic. Google hovering with Gemini Code Assist in the wings. And every one of them is trying to find the price point where users pay enough to cover costs but not so much that they switch to the competitor.

What Happens Next

Watch for Google to launch a $100 tier within weeks. Watch for Anthropic to respond with more generous limits or exclusive features. Watch for the usage caps to keep climbing because the real cost of AI coding is still going up, not down. Three million Codex users today. Ten million by year end. And every single one of them is about to learn that vibe coding is only free until you actually need it.